JP6465987B2 - Air conditioning apparatus and air conditioning control method - Google Patents

Description

  The present invention relates to an air-conditioning apparatus and an air-conditioning control method capable of simultaneously performing heating for warming indoor air and hot water supply for heating water, and particularly relates to a technique for increasing the temperature of air blown during heating. .

  Conventionally, there is a heat pump heat source system that simultaneously performs a heating operation for warming indoor air and a hot water supply operation for storing heat in a hot water storage tank as a hot water supply application. In such a conventional heat pump heat source system, heating and hot water supply can be performed in one system. For this reason, compared with the case where it builds with a separate system, an installation space can be made small. As a result, it is possible to provide a system including both heating and hot water supply even for a property with large installation restrictions.

JP 2014-109430 A

However, the prior art has the following problems.
Patent Document 1 discloses the following two methods for increasing the thermal efficiency during heating in a system capable of simultaneously performing heating with a heating heat medium and hot water supply with hot water with respect to one heat pump heat source device. ing.
(Method 1) Simultaneous operation is permitted when the temperature difference between the heating heat medium and the hot water is small.
(Method 2) Hot water flow distribution change control is performed so as to reduce the temperature difference between the heating heat medium and the hot water.

  However, when performing simultaneous operation of heating for heating air and hot water supply for heating hot water, if the temperature of the hot water is low, the refrigerant temperature of the heat pump heat source machine is lowered, and the heating capacity of the heating is lowered. For this reason, the temperature of the blown air supplied to the room is lowered. And when the wind with a low blown air temperature hits a human body, there is a problem that a feeling of cold wind is given and comfort is impaired. Therefore, it is necessary to devise such that the wind of low temperature blowing does not hit the human body.

  The present invention has been made in order to solve the above-described problems, and in the case of performing simultaneous operation of heating for heating indoor air and hot water supply for heating hot water, a low-temperature blowing wind that impairs comfort is a human body. An object is to obtain an air conditioning apparatus and an air conditioning control method that can quickly raise the condensation temperature from a low condensation temperature to a high condensation temperature.

An air conditioner according to the present invention measures a water heat exchanger that heats water by heat exchange with a refrigerant, a use-side heat exchanger that heats indoor air by heat exchange with a refrigerant, and a condensation temperature of the refrigerant. The condensing temperature measured by the condensing temperature detector is less than the preset target condensing temperature during simultaneous execution of the condensing temperature detector, heating operation by the water heat exchanger, and heating operation by the use side heat exchanger. In this case, the first control different from the normal control state at the time of simultaneous execution is performed so that the condensing temperature is equal to or higher than the target condensing temperature, and the condensing temperature becomes the target condensing temperature by the first control. When it has reached, it is provided with a control device that performs the condensation temperature adjustment control by performing the second control so as to return to the normal control state step by step .

The air conditioning control method according to the present invention includes a water heat exchanger that heats water by heat exchange with a refrigerant, a use-side heat exchanger that heats indoor air by heat exchange with the refrigerant, and a condensation temperature of the refrigerant. An air-conditioning control method executed by a control device having a microcomputer with respect to an air-conditioning device provided with a condensation temperature detector for measuring a heating operation by a water heat exchanger and utilization in the control device in a concurrent and heating operation by the side heat exchanger, the condensation temperature measured by the condensing temperature detector, if it is less than a preset target condensing temperature, to the condensation temperature and the target condensation temperature or higher In addition, the first control different from the normal control state at the time of simultaneous execution is performed, and when the condensing temperature reaches the target condensing temperature by the first control, the normal control state is gradually returned. A By performing the second control includes a control step of performing a condensation temperature adjustment control, the control step includes a first step to reduce the heating load of the water heat exchanger, the heating load of the utilization-side heat exchanger A second step for reducing the flow rate, a third step for controlling the flow rate of the refrigerant supplied to the water heat exchanger to be reduced, and a fourth step for increasing the flow rate of the refrigerant supplied to the use side heat exchanger. The condensation temperature adjustment control is executed by executing at least one of the steps.

  According to the present invention, by providing a control configuration for maintaining the refrigerant temperature at a temperature higher than that required for heating, comfort is impaired in the simultaneous operation of heating for heating indoor air and hot water supply for heating hot water. It is possible to obtain an air conditioning apparatus and an air conditioning control method that can quickly raise the condensation temperature from a low condensation temperature to a high condensation temperature so that low-temperature blown wind does not hit the human body.

It is the schematic which showed the whole structure of the air conditioning apparatus in Embodiment 1 of this invention. It is a refrigerant circuit block diagram of the air conditioning apparatus in Embodiment 1 of this invention. It is a block diagram which shows the structure of the air conditioning apparatus which concerns on Embodiment 1 of this invention. It is the flowchart which showed a series of operation | movement of the condensation temperature adjustment control performed with a control apparatus at the time of the heating hot water supply simultaneous operation of Embodiment 1 of this invention. It is the schematic which showed the driving | running state change at the time of implementing the condensation temperature adjustment control in Embodiment 1 of this invention. It is explanatory drawing regarding the condensation temperature adjustment control by pressure reduction mechanism capability distribution adjustment performed with the control apparatus in Embodiment 1 of this invention. It is explanatory drawing regarding the condensation temperature adjustment control by the use side air blower adjustment performed with the control apparatus in Embodiment 1 of this invention. It is explanatory drawing regarding the condensation temperature adjustment control by the water pump adjustment performed with the control apparatus in Embodiment 1 of this invention. It is the flowchart which showed the continuous operation | movement of the condensing temperature adjustment control by the heating temporary interruption performed with the control apparatus which concerns on Embodiment 1 of this invention.

  Hereinafter, preferred embodiments of an air-conditioning apparatus and an air-conditioning control method of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
<System configuration>
FIG. 1 is a schematic diagram showing the overall configuration of the air-conditioning apparatus according to Embodiment 1 of the present invention. A heat source unit 301 is disposed outside, a branch unit 302, a utilization unit 303a, and a hot water unit 304 are disposed on the first floor of the room, and a utilization unit 303b is disposed on the second floor of the room. And each unit is connected by piping, as shown in FIG.

  The use units 303a and 303b perform heating by supplying warm air into the room. Moreover, the hot water unit 304 stores hot water supply heat. FIG. 1 shows an example of unit installation, and the unit arrangement to which the present invention is applied is not limited to FIG. For example, the number of hot water units 304 may be two or more, and the use units 303a and 303b may be one or three or more.

<Equipment configuration>
FIG. 2 is a refrigerant circuit configuration diagram of the air-conditioning apparatus 100 according to Embodiment 1 of the present invention. The air conditioner 100 according to the first embodiment shown in FIG. 2 performs a steam compression cycle operation, thereby performing a heating command (heating ON / OFF) by the use units 303a and 303b and a hot water supply by the hot water unit 304. Request commands (hot water supply ON / OFF) can be processed simultaneously.

  The heat source unit 301 and the branch unit 302 are connected via a pipe 3 and a pipe 9 that are refrigerant pipes. The branch unit 302 and the utilization units 303a and 303b are connected to each other through pipes 4a and 4b and pipes 7a and 7b, which are refrigerant pipes. Further, the branch unit 302 and the hot water unit 304 are connected via a pipe 10 and a pipe 12 which are refrigerant pipes.

  The refrigerant used for the air conditioner is not particularly limited. For example, natural refrigerants such as HFC (Hydro Fluoro Carbon) refrigerants such as R410A and R32, HCFC (Hydro Chloro Fluoro Carbon) refrigerants, hydrocarbons, and helium can be used.

  The heat source unit 301 includes the compressor 1, the four-way valve 2, the heat source side heat exchanger 14, the heat source side blower 15, and the accumulator 16. A pressure sensor 201 is provided on the discharge side of the compressor 1 and measures the refrigerant pressure at the installation location. Moreover, the temperature sensor 202 is provided in the discharge side of the compressor 1, and the temperature sensor 212 is provided in the liquid side of the heat source side heat exchanger 14, and each measures the refrigerant | coolant temperature of an installation place. Moreover, the temperature sensor 207 is provided in the air inlet and measures the outside air temperature.

  The branch unit 302 is configured to include use side decompression mechanisms 8 a and 8 b and a hot water side decompression mechanism 13. Moreover, the temperature sensors 203a and 203b are provided on the gas side of the utilization units 303a and 303b, and the temperature sensor 206 is provided on the gas side of the hot water unit 304, and measures the refrigerant temperature at each installation location.

  The utilization unit 303a includes a utilization side heat exchanger 5a and a utilization side blower 6a. Similarly, the use unit 303b includes a use side heat exchanger 5b and a use side blower 6b. Both the use side blowers 6a and 6b can adjust the amount of blown air. And utilization unit 303a, 303b blows off indoor air suck | inhaled by the function of utilization side air blowers 6a, 6b, after making it heat-exchange with a refrigerant | coolant in utilization side heat exchanger 5a, 5b.

  In the usage units 303a and 303b, temperature sensors 205a and 205b are provided on the liquid side of the usage-side heat exchangers 5a and 5b, and the refrigerant temperatures at the respective installation locations are measured. Further, temperature sensors 204a and 204b are provided on the indoor air inlet side, and measure the temperature of the indoor air flowing into the unit.

  The hot water unit 304 includes the water heat exchanger 11 and a water side circuit. Here, the water side circuit is constituted by a water pump 17, a coil heat exchanger 18, and a hot water storage tank 19, and the aqueous medium circulates in the water circuit as a heat exchange medium. The water pump 17 is configured so that the rotation speed can be varied by an inverter, and circulates the aqueous medium. The hot water storage tank 19 is a full-water type.

  Although not shown in detail in FIG. 2, the hot water storage tank 19 stores boiling hot water, and hot water is discharged from the upper part of the tank in response to a hot water request. Water is supplied from the bottom of the tank. In addition, what is used as an aqueous medium is brine etc. which mixed water or antifreeze.

  In the hot water unit 304, a temperature sensor 208 is provided on the liquid side of the water heat exchanger 11, and the temperature sensor 208 measures the refrigerant temperature at the installation location. Further, the temperature sensor 209 is installed on the downstream side of the water heat exchanger 11, the temperature sensor 210 is installed on the upstream side of the water heat exchanger 11, and the temperature sensor 211 is installed on the side surface of the hot water storage tank 19, and each installation is performed. Measure the water temperature at the location.

  Next, the operation state of the water side circuit will be described. The aqueous medium fed by the water pump 17 is heated by the refrigerant in the water heat exchanger 11 and becomes high temperature. Then, the aqueous medium that has reached a high temperature flows into the hot water storage tank 19, and the hot water is heated by the coil heat exchanger 18, thereby lowering the temperature. Thereafter, the aqueous medium is retransmitted to the water heat exchanger 11 through the hot water storage tank 19 and becomes hot water in the water heat exchanger 11. In such a process, hot water is boiled in the hot water storage tank 19.

  Next, specific control contents by the control device 101 will be described in detail. FIG. 3 is a block diagram showing a configuration of the air-conditioning apparatus according to Embodiment 1 of the present invention. FIG. 3 shows a connection configuration of a control device 101 that controls the air-conditioning apparatus 100 according to Embodiment 1, and a sensor group that is an input to the control device 101 and an actuator group that is an output. . Although not shown in FIG. 3, the control device 101 is configured to be able to read commands from the remote controller.

  The sensor group is a generic name including various temperature sensors 202 to 212 and a pressure sensor 201. The actuator group is a generic name including the compressor 1, the four-way valve 2, the pressure reducing mechanisms 8 a, 8 b, 13, the blowers 6 a, 6 b, 15, and the water pump 17.

  The control device 101 includes a measurement unit 102, a calculation unit 103, a control unit 104, and a storage unit 105.

  The measurement unit 102 reads various amounts detected by the pressure sensor 201 and the various temperature sensors 202 to 212. Then, the calculation unit 103 executes control calculation based on the information read via the measurement unit 102. And the control part 104 controls an actuator group by performing control operation based on the calculation result by the calculating part 103. FIG.

  In addition, the control device 101 includes a storage unit 105 that stores a predetermined constant, a setting value transmitted from the remote controller, or the like. The control unit 104 can refer to and rewrite the stored contents as necessary.

  Although not shown in FIGS. 2 and 3, the branch unit 302, the utilization units 303 a and 303 b, and the hot water unit 304 are connected to the heat source unit 301 by communication lines (wired or wireless), respectively. . With such a configuration, the control unit 104 in the control device 101 can directly instruct the control operation to each of the branch unit 302, the use units 303a and 303b, and the hot water unit 304.

  The measurement unit 102, the calculation unit 103, and the control unit 104 described above are configured by a microcomputer, and the storage unit 105 is configured by a semiconductor memory or the like.

  2 illustrates the case where the control device 101 is arranged in the heat source unit 301, the arrangement location of the control device 101 is not limited to this.

  Further, the user can select cooling ON / OFF, heating ON / OFF, and hot water supply ON / OFF via the remote controller, and can also input the indoor set temperature and the boiling temperature. And the control part 104 in the control apparatus 101 can read the setting data based on a user's operation.

  In addition, when the temperature detected by the temperature sensor 211 installed on the side wall of the hot water storage tank 19 read by the measuring unit 102 is equal to or lower than a predetermined value (for example, 45 ° C. or lower) It can be automatically determined that the hot water supply is ON.

<Heating and hot water simultaneous operation mode>
Next, the specific control method for quickly starting the condensation temperature from the low condensation temperature to the high condensation temperature, which is the object of the present application, and executing the heating and hot water simultaneous operation mode without impairing comfort is described in detail. Explained.

  The air conditioning apparatus 100 according to Embodiment 1 can simultaneously process heating ON and hot water supply ON set by a remote controller, and can perform simultaneous heating and hot water supply operation. Below, the refrigerant | coolant flow state in the heating hot-water supply simultaneous operation mode and the control method of each apparatus are demonstrated.

  In the heating / hot water simultaneous operation mode, the four-way valve 2 has the discharge side of the compressor 1 connected to the pipe 3 and the suction side of the compressor 1 connected to the gas side of the heat source side heat exchanger 14. The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows through the pipe 3 via the four-way valve 2 and is distributed to the pipes 4 a and 4 b and the pipe 10.

  The refrigerant flowing in the pipes 4a and 4b flows into the use side heat exchangers 5a and 5b, heats the indoor air supplied by the use side blowers 6a and 6b, and flows out from the use side heat exchangers 5a and 5b. Thereafter, the refrigerant flowing out from the use side heat exchangers 5a and 5b is decompressed by the use side decompression mechanisms 8a and 8b via the pipes 7a and 7b, and passes through the pipes 10 and 12 and the hot water side decompression mechanism 13. To join.

  On the other hand, the refrigerant distributed to the pipe 10 flows into the water heat exchanger 11 and heats the intermediate water supplied by the water pump 17. Thereafter, the refrigerant flows out of the water heat exchanger 11, is depressurized by the hot water side depressurization mechanism 13 via the pipe 12, is distributed to the pipes 4a and 4b, and is depressurized by the use side depressurization mechanisms 8a and 8b. To join.

  The merged refrigerant flows into the heat source side heat exchanger 14 via the pipe 9, exchanges heat with the outdoor air supplied by the heat source side blower 15, and becomes a low-pressure gas refrigerant. The low-pressure gas refrigerant flowing out from the heat source side heat exchanger 14 is then sucked into the compressor 1 again after passing through the accumulator 16 via the four-way valve 2.

  In the hot water supply ON state, the operation frequency of the compressor 1 is fixed at a maximum, giving priority to the prevention of hot water shortage. Moreover, the rotation speed of the heat source side blower 15 is fixed at the maximum rotation speed. The rotation speed of the use side blowers 6a and 6b is fixed to the command value set and input by the user with the remote controller, and the rotation speed of the water pump 17 is fixed to a predetermined rotation speed.

  The use side decompression mechanisms 8a and 8b and the hot water side decompression mechanism 13 are opened by the control device 101 according to the capacity ratio of each unit based on the capacity of the use unit 303a, the capacity of the use unit 303b, and the capacity of the hot water unit 304. Degree controlled.

  For example, when the use unit 303a is 0.5 horsepower, the use unit 303b is 0.8 horsepower, and the hot water unit 304 is 2 horsepower, the use side decompression mechanism 8a is 100 pulses, the use side decompression mechanism 8b is 160 pulses, and the hot water side decompression. The opening degree of the mechanism 13 is controlled as 400 pulses. Note that the capacity of each unit is stored in the storage unit 105 in advance.

<Condensation temperature adjustment control>
FIG. 4 is a flowchart showing a series of operations of condensing temperature adjustment control executed by control device 101 during the simultaneous heating and hot water supply operation of Embodiment 1 of the present invention. First, in step S401, the control device 101 starts a heating operation of the use units 303a and 303b by receiving a heating command that is heating ON.

  Next, in step S402, the control device 101 determines whether or not the operation of the hot water unit 304 is started. If the determination is No, the control apparatus 101 repeats Step S402. If the determination is Yes, the control apparatus 101 proceeds to Step S403. In step S <b> 403, the control device 101 continues the operation as it is for each of the usage units 303 a and 303 b and the hot water unit 304 for a predetermined time.

  In step S404, the control device 101 determines whether or not the condensing temperature is equal to or lower than a preset low condensing temperature. Here, the condensation temperature can be detected as a saturation temperature corresponding to the pressure measured by the pressure sensor 201. Therefore, the pressure sensor 201 corresponds to a condensation temperature detector.

  However, the detection of the condensation temperature is not limited to such a configuration. For example, a temperature sensor may be installed in the use side heat exchangers 5a and 5b, and the temperature measured by the temperature sensor may be used as the detection value of the condensation temperature.

  When the condensing temperature is equal to or lower than the low condensing temperature, the control device 101 proceeds to step S405 and performs condensing temperature adjustment control. On the other hand, if the condensing temperature is not lower than the low condensing temperature, the control device 101 proceeds to step S406 and continues normal operation without performing the condensing temperature adjustment control.

  In the hot water unit 304, when hot water in the hot water storage tank 19 (approximately 55 ° C.) is discharged from the upper part of the tank, city water (approximately 10 ° C.) is introduced from the lower part of the tank. When the city water enters the installation height of the temperature sensor 211 and the temperature measured by the temperature sensor 211 falls below the boiling start temperature (for example, 45 ° C.), the operation of the hot water unit 304 is turned on.

  Therefore, at the beginning of hot water supply, low-temperature water enters the water heat exchanger 11, and the condensation temperature rapidly decreases. Further, when the condensation temperature is lowered, the heat exchange amount of the use side heat exchangers 5a and 5b is lowered, and the blowing temperature is lowered.

  As a result, the low temperature wind is blown into the room, and the low temperature wind hits the human body, resulting in a decrease in comfort. The temperature of the human body is about 36 ° C. For this reason, it is necessary to ensure that the blowing temperature is 36 ° C. or higher, and it is also necessary to set the target condensation temperature for maintaining comfort to be 36 ° C. or higher. Hereinafter, the target condensation temperature for maintaining comfort is referred to as a heating target condensation temperature.

  In addition, when hot water is not used for a long time and the temperature measured by the temperature sensor 211 is lower than the boiling temperature due to heat radiation from the tank, and the hot water unit 304 starts operation, relatively hot water flows into the water heat exchanger 11. To do. For this reason, the condensation temperature does not decrease.

  FIG. 5 is a schematic diagram showing changes in the operating state when the condensation temperature adjustment control in the first embodiment of the present invention is performed. The horizontal axis indicates the specific enthalpy (kJ / kg), and the vertical axis indicates the pressure (MPaG).

  The control device 101 according to the first embodiment performs an operation of increasing the condensation temperature from the low condensation temperature to the high condensation temperature as shown in FIG. 5 by the condensation temperature adjustment control. Specific operations for raising the condensation temperature include decompression mechanism capacity distribution adjustment, use side blower adjustment, water pump adjustment, heating temporary interruption, heating operation ON restriction, and the like.

  In the following, the operation of raising the condensation temperature by adjusting the water pump is referred to as “water heat exchanger heating load adjustment” or “first heating load adjustment”, and the condensation temperature is raised by adjusting the use side blower or temporarily stopping heating. The operation is referred to as “use side heat exchanger heating load adjustment” or “second heating load adjustment”.

  In executing the condensing temperature adjustment control, one of the above-described operations may be performed, and a plurality of operations may be appropriately combined as necessary and performed simultaneously or in an appropriate order. Also good.

  First, the control device 101 determines which of the water heat exchanger heating load and the use side heat exchanger heating load is to be reduced. Which one to make smaller can be set in advance by the heat source unit 301 during the installation work, and may be set by the user.

  At the time of user setting, which is the latter, the control device 101 determines that the water heat exchanger heating load is reduced with the setting of heating priority, and determines that the user side heat exchanger heating load is reduced with the setting of hot water supply priority.

  If the condensing temperature does not increase to the heating target condensing temperature even if the heating load is reduced, the control device 101 then performs decompression mechanism capacity distribution adjustment so that the condensing temperature is increased. Control the decompression mechanism.

  However, the condensation temperature adjustment control in the first embodiment may be performed in the order in which the heating load is reduced after the decompression mechanism capacity distribution adjustment is performed.

  FIG. 6 is an explanatory diagram relating to the condensation temperature adjustment control by the decompression mechanism capability distribution adjustment executed by the control device 101 according to the first embodiment of the present invention. The upper part shows the time change of the decompression mechanism opening (pulse), the middle part shows the time change of the condensation temperature (° C.), and the lower part shows the time change of the tank water temperature (° C.).

  At time T0, the control device 101 throttles the decompression mechanism 13 on the water heat exchanger 11 side so that the condensation temperature is equal to or higher than the target condensation temperature during heating, and the decompression mechanism 8a on the use side heat exchangers 5a and 5b side. Open 8b.

  Thereafter, when the condensing temperature becomes equal to or higher than a control threshold value that is 2 ° C. higher than the heating target condensing temperature, for example, the control device 101 gradually opens the pressure reducing mechanism 13 on the water heat exchanger 11 side, On the other hand, the decompression mechanism 8a on the use side heat exchangers 5a, 5b side is closed to return to the normal control state. FIG. 6 illustrates a case where the decompression mechanism opening is gradually returned to the normal control state at two stages of time T1 and time T2.

  In this way, by performing the condensation temperature adjustment control using the opening degree of the decompression mechanisms 8a, 8b, and 13 as the controlled variable, the condensation temperature is quickly made higher than the heating target condensation temperature as shown in the middle and lower parts of FIG. In addition, the tank water temperature of the hot water storage tank 19 can be raised. As a result, the heating capacity on the use side heat exchangers 5a and 5b side is increased, and the blown air temperature can be increased.

  FIG. 7 is an explanatory diagram regarding condensing temperature adjustment control by use side blower adjustment executed by the control device 101 according to Embodiment 1 of the present invention. The upper part shows the time change of the use side fan rotation speed (rpm), the middle part shows the time change of the condensation temperature (° C.), and the lower part shows the time change of the tank water temperature (° C.).

  The control device 101 automatically lowers the fan rotation speed (fan notch) of the use side blowers 6a and 6b at time T0 so that the condensation temperature becomes equal to or higher than the heating target condensation temperature. Thereafter, when the condensing temperature becomes equal to or higher than the control threshold, the control device 101 returns the fan rotation speed of the use side fans 6a and 6b to the set value and returns to the normal control state. FIG. 7 illustrates a case where the control device 101 switches the use-side fan rotation speed from the weak notch to the strong notch and returns to the normal control state at one stage of time T3.

  In this way, by performing the condensation temperature adjustment control using the rotation speed of the use side blowers 6a and 6b as the control amount, the condensation temperature is quickly made higher than the heating target condensation temperature as shown in the middle and lower stages of FIG. In addition, the tank water temperature of the hot water storage tank 19 can be raised. As a result, the amount of air supplied to the room is reduced, and the blown air temperature can be increased.

  FIG. 8 is an explanatory diagram regarding condensing temperature adjustment control by water pump adjustment executed by the control device 101 according to Embodiment 1 of the present invention. The upper part shows the time change of the water pump rotation speed (rpm), the middle part shows the time change of the condensation temperature (° C.), and the lower part shows the time change of the tank water temperature (° C.).

  The control device 101 controls the rotational speed of the water pump 17 to be gradually lowered at time T0 so that the condensing temperature becomes equal to or higher than the heating target condensing temperature. Thereafter, when the condensing temperature becomes equal to or higher than the heating target condensing temperature, the control device 101 increases the rotation speed of the water pump 17 as the tank water temperature of the hot water storage tank 19 increases. FIG. 8 illustrates a case where the control device 101 switches the rotation speed of the water pump 17 from lowering to increasing at time T4.

  Thereafter, at time T5 when the water pump rotation speed has increased to the set rotation speed, the control device 101 performs control so as to be fixed at the rotation speed, thereby further increasing the condensation temperature.

  Thus, by performing the condensation temperature adjustment control with the rotation speed of the water pump 17 as the control amount, as shown in the middle and lower stages of FIG. 8, the condensation temperature is quickly made higher than the heating target condensation temperature, The tank water temperature of the hot water storage tank 19 can be raised. As a result, the heating capacity of the use side heat exchangers 5a and 5b is increased, and the blown air temperature can be increased.

Next, the condensing temperature adjustment control by temporary interruption of heating will be described.
In recent years, the heat insulation performance of houses has been further improved, and it is assumed that the heating load is lower than that of conventional houses. And if a wall is warmed, indoor air temperature will not fall so much even if heating OFF is carried out. That is, if the number of highly insulated houses increases in the future, the heating load is expected to decrease, and it is considered that the condensing temperature adjustment control by the temporary suspension of heating becomes effective.

  FIG. 9 is a flowchart showing a series of operations for condensing temperature adjustment control by temporary suspension of heating executed by control device 101 according to Embodiment 1 of the present invention. A case where the control according to this flowchart is applied to each of the usage units 303a and 303b will be described below.

  First, in step S901, the control device 101 determines whether or not the condensing temperature is equal to or higher than the heating target condensing temperature. And the control apparatus 101 complete | finishes a series of processes, when a condensation temperature is more than the heating target condensation temperature. On the other hand, if the condensing temperature is not equal to or higher than the heating target condensing temperature, the control device 101 proceeds to step S902.

In step S902, the control apparatus 101 determines whether the indoor temperature difference is equal to or less than the interruption determination threshold with respect to the usage units 303a and 303b. Here, the indoor temperature difference is a temperature difference between the set temperature of the use units 303a and 303b and the blown air temperature measured by the temperature sensors 204a and 204b, and is defined as the following equation.
Indoor temperature difference = set temperature-blown air temperature

  Moreover, as an interruption determination threshold value, 3 degreeC can be set, for example. And the control apparatus 101 judges that the indoor wall is warmed about the utilization unit whose indoor differential temperature is below an interruption determination threshold value, and does not heat the utilization side heat exchangers 5a and 5b in step S903. Heating is temporarily interrupted, and the corresponding usage units 303a and 303b are turned off.

  On the other hand, regarding the usage unit for which it is determined in step S902 that the indoor temperature difference is not equal to or less than the interruption determination threshold, the control device 101 determines that the indoor wall is cold, and in step S904, the corresponding usage is determined. The heating of the units 303a and 303b is continued while being ON, and the process proceeds to step S905.

  In step S905, control device 101 determines whether or not the condensing temperature is equal to or higher than the heating target condensing temperature. When the control device 101 determines that the condensing temperature is equal to or higher than the heating target condensing temperature, the control device 101 proceeds to step S906. If there is a use unit that has been temporarily suspended, the corresponding use unit is determined in step S907. Heating is started and heating is turned on.

  As described above, the control device 101 performs the condensation temperature adjustment control so that the heating unit is kept ON for a usage unit having a high indoor heating load, and the heating unit is turned OFF for a usage unit having a low indoor heating load. Do. As a result, comfort is not impaired in a room where heating is turned off, and the blown air temperature can be increased in a room where heating is turned on.

  During the simultaneous operation, the heating operation ON restriction may be applied so that the user can set the priority order of the use side heat exchangers 5a and 5b for interrupting the heating in advance. As a specific example of performing such heating operation ON restriction, for example, in the first-floor living, the control device 101 preferentially stops the heating in the second-floor living during simultaneous operation when it is desired to stop heating as much as possible. Like that. By performing such control, the opportunity to interrupt the heating of the first floor living room can be reduced, high comfort can be ensured, and the driving state can be easily stabilized.

  Moreover, you may enable a user to set beforehand the utilization unit which should apply the heating temporary interruption process by the flowchart of FIG. By performing such control, heating of the first floor living room is not interrupted, high comfort can be ensured, and the driving state can be easily stabilized.

  Further, as the condensing temperature adjustment control based on the indoor temperature difference, a method other than the temporary interruption operation of the heating can be considered. Specifically, when the calculated indoor differential temperature is less than or equal to a preset differential temperature determination threshold, the use side heat exchanger heating load is reduced, and when the indoor differential temperature is greater than the differential temperature determination threshold Reduce the heating load of the water heat exchanger. By performing such control, it is possible to prevent impairing comfort.

Further, as a simple condensing temperature adjustment control, the control device 101 can also adopt the following method.
(Method 1) During simultaneous execution of the heating operation by the water heat exchanger and the heating operation by the user side heat exchanger, the heating operation of only the user side heat exchanger without heating the water heat exchanger is performed. The heating load of the use side heat exchanger is made smaller than the heating load.
(Method 2) During the simultaneous execution of the heating operation by the water heat exchanger and the heating operation by the use side heat exchanger, the heating of the preset use side heat exchanger is stopped.

  As described above, according to the first embodiment, the condensation temperature adjustment control is performed by specific operations such as pressure reduction mechanism capacity distribution adjustment, use side blower adjustment, water pump adjustment, heating suspension, and heating operation ON restriction. Thus, the condensing temperature can be quickly raised from the low condensing temperature to the high condensing temperature during the simultaneous execution of heating and hot water supply.

  As a result, when performing simultaneous operation of heating that heats indoor air and hot water supply that heats hot and cold water, it is condensed from a low condensation temperature to a high condensation temperature so that low-temperature blowout air that impairs comfort does not hit the human body. An air-conditioning apparatus and an air-conditioning control method that can quickly raise the temperature can be realized.

Claims (14)

A water heat exchanger that heats water by heat exchange with the refrigerant;
A use side heat exchanger that heats indoor air by heat exchange with the refrigerant;
A condensing temperature detector for measuring the condensing temperature of the refrigerant;
During the simultaneous execution of the heating operation by the water heat exchanger and the heating operation by the use side heat exchanger, the condensation temperature measured by the condensation temperature detector is less than a preset target condensation temperature. In this case, a first control different from a normal control state at the time of simultaneous execution is performed so that the condensation temperature is equal to or higher than the target condensation temperature, and the condensation temperature is set to the target temperature by the first control. An air conditioner comprising: a control device that performs condensing temperature adjustment control by performing second control so as to gradually return to the normal control state when the condensing temperature is reached. The water heat exchanger has a hot water side pressure reducing mechanism for controlling the flow rate of the refrigerant,
The use side heat exchanger has a use side pressure reducing mechanism for controlling the flow rate of the refrigerant,
The control device, wherein Ri down the hot water side pressure reducing mechanism, an air conditioning apparatus according to claim 1 to perform the condensation temperature adjustment control by performing the first control by opening the utilization side pressure reducing mechanism. The control device adjusts a first heating load that reduces a first heating load that is a heating load of the water heat exchanger, and second heating that reduces a second heating load that is a heating load of the use side heat exchanger. The air conditioner according to claim 1 or 2, wherein the condensation temperature adjustment control is executed by performing the first control by performing at least one of load adjustments. The control device acquires an indoor air temperature heated by the use side heat exchanger as a detected value from a temperature sensor, and based on the indoor set temperature and the air temperature, the second heating load The air conditioner according to claim 3, wherein it is determined whether or not the first heating load is reduced. The utilization side heat exchanger is a plurality of utilization side heat exchangers composed of at least two or more,
The control device acquires the air temperature in each room individually heated by each of the plurality of use side heat exchangers as a detection value from each temperature sensor, and sets the air temperature and the set temperature for each room. For the use side heat exchanger corresponding to the room whose temperature difference is equal to or less than the preset interruption determination threshold, heating is temporarily interrupted without heating, and the room corresponding to the room where the differential temperature is greater than the interruption determination threshold The air conditioning apparatus according to any one of claims 1 to 4, wherein the user side heat exchanger performs the first control by continuing heating to perform the condensation temperature adjustment control. The controller sets in advance the order of use side heat exchangers that temporarily suspend heating as an interruption priority order, and there are a plurality of use side heat exchangers corresponding to the room where the temperature difference is equal to or less than the interruption determination threshold. 6. The air conditioner according to claim 5, wherein the heating is temporarily suspended in order from the use side heat exchanger having the highest priority according to the interruption priority. The control device preliminarily sets a use-side heat exchanger that temporarily suspends heating when performing the condensation temperature adjustment control that sets the condensation temperature to be equal to or higher than the target condensation temperature, as the interruption heat exchanger, The air conditioner according to claim 5, wherein heating of a use side heat exchanger corresponding to the interruption heat exchanger is temporarily interrupted among use side heat exchangers corresponding to a room whose differential temperature is equal to or less than the interruption determination threshold. . The use side heat exchanger has a use side blower for supplying room air,
The air according to any one of claims 1 to 7, wherein the control device performs the condensation temperature adjustment control by performing the first control by controlling a rotation speed of the use-side blower to be low. Harmony device. The water heat exchanger has a water pump for supplying a heat medium,
The air conditioning according to any one of claims 1 to 8, wherein the control device performs the condensation temperature adjustment control by performing the first control by controlling a rotation speed of the water pump to be low. apparatus. The control device is heating the use side heat exchanger without heating the water heat exchanger while simultaneously performing the heating operation by the water heat exchanger and the heating operation by the use side heat exchanger. The air conditioning apparatus according to any one of claims 1 to 9, wherein a heating load of the use side heat exchanger is reduced. The said control apparatus stops the heating of the preset use side heat exchanger during the simultaneous execution of the heating operation by the said water heat exchanger and the heating operation by the said use side heat exchanger. The air conditioning apparatus of Claim 1. A water heat exchanger that heats water by heat exchange with the refrigerant;
A use side heat exchanger that heats indoor air by heat exchange with the refrigerant;
An air conditioning control method executed by a control device having a microcomputer for an air conditioning device comprising a condensation temperature detector for measuring the condensation temperature of the refrigerant,
In the control device,
During the simultaneous execution of the heating operation by the water heat exchanger and the heating operation by the use side heat exchanger, the condensation temperature measured by the condensation temperature detector is less than a preset target condensation temperature. In this case, a first control different from a normal control state at the time of simultaneous execution is performed so that the condensation temperature is equal to or higher than the target condensation temperature, and the condensation temperature is set to the target temperature by the first control. When the condensation temperature is reached, the second control is performed so as to gradually return to the normal control state, thereby performing a control step for executing the condensation temperature adjustment control,
The control step includes
A first step of performing the first control by reducing a heating load of the water heat exchanger;
A second step of performing the first control by reducing the heating load of the use side heat exchanger;
A third step for performing the first control by controlling to reduce the flow rate of the refrigerant supplied to the water heat exchanger;
Fourth step of performing the first control by controlling to increase the flow rate of the refrigerant supplied to the use side heat exchanger.
Air-conditioning control how to have a. A water heat exchanger that heats water by heat exchange with the refrigerant;
A use side heat exchanger that heats indoor air by heat exchange with the refrigerant;
A condensing temperature detector for measuring the condensing temperature of the refrigerant;
During the simultaneous execution of the heating operation by the water heat exchanger and the heating operation by the use side heat exchanger, the condensation temperature measured by the condensation temperature detector is less than a preset target condensation temperature. A condensing temperature adjustment control for setting the condensing temperature to be equal to or higher than the target condensing temperature, and
The control device includes:
At least one of a first heating load adjustment that reduces the first heating load that is the heating load of the water heat exchanger and a second heating load adjustment that reduces the second heating load that is the heating load of the user-side heat exchanger. By performing either of these, the condensation temperature adjustment control is executed,
The indoor air temperature heated by the use side heat exchanger is acquired as a detection value from a temperature sensor, and the second heating load is reduced based on the indoor set temperature and the air temperature, Or the air conditioning apparatus which determines whether the said 1st heating load is made small. A water heat exchanger that heats water by heat exchange with the refrigerant;
A use side heat exchanger that heats indoor air by heat exchange with the refrigerant;
A condensing temperature detector for measuring the condensing temperature of the refrigerant;
During the simultaneous execution of the heating operation by the water heat exchanger and the heating operation by the use side heat exchanger, the condensation temperature measured by the condensation temperature detector is less than a preset target condensation temperature. A condensing temperature adjustment control for setting the condensing temperature to be equal to or higher than the target condensing temperature, and
The utilization side heat exchanger is a plurality of utilization side heat exchangers composed of at least two or more,
The control device acquires the air temperature in each room individually heated by each of the plurality of use side heat exchangers as a detection value from each temperature sensor, and sets the air temperature and the set temperature for each room. For the use side heat exchanger corresponding to the room whose temperature difference is equal to or less than the preset interruption determination threshold, heating is temporarily interrupted without heating, and the room corresponding to the room where the differential temperature is greater than the interruption determination threshold About a use side heat exchanger, the air conditioning apparatus which performs the said condensation temperature adjustment control by continuing a heating.

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